For a 20 A, 230 V energy meter, the number of revolutions per KWh is 480. If upon test at full load, the disc makes 50 revolutions in 76 seconds, determine the error in the following as a percentage of metered values: (i)power consumed and (ii) energy

For a 20 A, 230 V energy meter, the number of revolutions per KWh is 480. If upon test at full load, the disc makes 50 revolutions in 76 seconds, determine the error in the following as a percentage of metered values: (i)power consumed and (ii) energy

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.7MCQ: Consider Figure 3.5. Match the following, those on the left to those on the right. (i) Im (a)...

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

(i)power consumed and

(ii) energy consumed. Comment on the results. Suggest the corrective actions to be taken.

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